package com.usian.app.filter;

import com.usian.app.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Component
public class AuthorizeFilter implements GlobalFilter, Ordered {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        /*获取请求对象和响应对象*/
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断当前的请求是否为登录，如果是，直接放行
        if(request.getURI().getPath().contains("/api/v1/login/login_auth")){
            //放行
            return chain.filter(exchange);
        }

        //3.获取当前用户的请求头jwt信息
        HttpHeaders headers = request.getHeaders();
        String token = headers.getFirst("token");

        //4.判断当前令牌是否存在
        if (StringUtils.isEmpty(token)){
                //如果不存在，向客户端返回错误提示信息
                  response.setStatusCode(HttpStatus.UNAUTHORIZED);
                  return response.setComplete();
        }

        try {
            //5.如果令牌存在，解析jwt令牌，判断该令牌是否合法，如果不合法，则向客户端返回错误信息
            Claims claims = AppJwtUtil.getClaimsBody(token);
            System.out.println(claims);
            /*判断token是否有效*/
            int result = AppJwtUtil.verifyToken(claims);
            if(result == 0 || result == -1){
                Integer id = (Integer) claims.get("id");

                /*鉴权id有效重新存在请求头里*/
                ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                    httpHeaders.add("userId", id + "");
                }).build();
                exchange.mutate().request(serverHttpRequest).build();
            }
            //6.放行
            return chain.filter(exchange);
        } catch (Exception e) {
            e.printStackTrace();
            //想客户端返回错误提示信息
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

    }

    @Override
    public int getOrder() {
        return 0;
    }
}
